refactor: move directories around a bit

src/platform/pc/impl.zig

@@ -0,0 +1,62 @@
+const b = @import("base");
+const amd64 = b.arch;
+const std = @import("std");
+
+const ki = b.ke.private;
+const cpu = amd64.cpu;
+
+pub const name = "PC";
+
+const com1 = 0x3F8;
+
+fn com1_init() linksection(b.init) void {
+    cpu.outb(com1 + 0x3, 0x80);
+    cpu.outb(com1 + 0x0, 0x0c);
+    cpu.outb(com1 + 0x1, 0x00);
+    cpu.outb(com1 + 0x3, 0x03);
+    cpu.outb(com1 + 0x2, 0xc7);
+    cpu.outb(com1 + 0x4, 0x00);
+}
+
+fn com1_write(c: u8) void {
+    while ((cpu.inb(com1 + 0x5) & 0x20) == 0) {}
+    if (c == '\n') {
+        cpu.outb(com1, '\r');
+    }
+    cpu.outb(com1, c);
+}
+
+pub fn early_init() linksection(b.init) void {
+    com1_init();
+
+    cpu.detect_cpu_features();
+
+    const f = cpu.cpu_features;
+
+    std.log.info("amd64/cpu: {s}", .{&f.brand_string});
+    std.log.info("amd64/cpu: vendor={s} x2apic={} la57={} nx={} pcid={} pge={} smap={} smep={} pdpe1g={} invtsc={} xsave={} fxsave={} tsc-deadline={}", .{
+        &f.vendor_string,
+        @intFromBool(f.x2apic),
+        @intFromBool(f.five_level_paging),
+        @intFromBool(f.nx),
+        @intFromBool(f.pcid),
+        @intFromBool(f.pge),
+        @intFromBool(f.smap),
+        @intFromBool(f.smep),
+        @intFromBool(f.gib_pages),
+        @intFromBool(f.invariant_tsc),
+        @intFromBool(f.xsave),
+        @intFromBool(f.fxsave),
+        @intFromBool(f.tsc_deadline),
+    });
+}
+
+pub fn late_init() void {}
+
+pub fn devices_init() void {}
+
+pub fn debug_write(c: u8) void {
+    com1_write(c);
+}
+
+pub fn arm_timer(_: u64) void {}